The total number of points for a resort cannot change... if the points for one type of room one time of year goes up, there has to be a corresponding drop somewhere else on the
point chart. ESSENTIALLY the points required for a room will always stay the same. There might be small tweaks if demand changes (if one season becomes more popular than it is now or something) but for the most part the number of points required for the average week at a
DVC will stay the same.
That said, the one thing that WILL go up is dues. We bought in 1999 and dues were $4.02/point. A standard studio at the boardwalk is 85 points during value season (when we traveled, early january). For one week in a standard studio, the cost of maintenance fees was $342. When we used to pay cash we used to get an AP discounted rate of $169/night at BWI. With tax that was $1320 for a week. That was back in 1999.
Now in 2006, our dues are $4.69/point so those 85 points would run us nearly $400 in maintenance fees. That's approximately a 15% rise over the course of the last 7 years (with larger increases more recently). The best rate same time of year looks like it is $209 for the same room with AP discount. With tax for 7 nights that would be $1621, or approximately a 24% rise over the 1999 prices. As you can see, although dues have gone up they haven't gone up as quickly as hotel rates have.
Of course maintenance fees do not represent the total cost of buying into DVC but they do represent the changing cost.
It's pretty unlikely that disney will monkey around with the
point charts very much. What they have seems to work pretty well now. The short answer is that no, the number of points required every year for the same accommodations won't go up but what you pay for dues will. It's a little more complicated than that but even so, it's not like disney can just raise the number of points required for all room types across the board (which is what it sounds like your husband is afraid of). They have been doing this for things like exchanges out and cruises and using your points to stay at NON DVC resorts but for your home resort the points required for accommodations are stable.